OnCollisionStay for seconds then destroy

what i want is when a gameobject collides with a wall for some seconds then the wall will be destroyed. heres the script on the wall

 var Touched: float = 0.0; 
 var DC: float = 1.0;
 
 
 function OnCollisionStay (other:Collision)
 {
 if (other.gameObject.name=="enemy")
 {
 Touched += DC * Time.deltaTime;
 }
 Debug.Log(Touched);
 if (Touched >= 1000) {
     Destroy(this.gameObject);
   }
 
 
 }

but as soon as the object touches the wall without waiting it is destroyed. any ideas?